Machine for milling double helical-toothed wheels.



0. wsT-KUNZ. MACHINE FOR MILLING DOUBLE HELIGAL TOOTHED WHEELS.

APPLICATION FILED JULY 25. 1904.

Patented Oct. 12, 1909.

2 SHEETS-SHEET 1.

vwentoa c. WUsT-KUNZ. MACHINE FOR MILLING DOUBLE HELIGAL TOOTHED WHEELS.

APPLICATION FILED JULYA25. 1904.

Patented Oct. 12, 1909.

2 SHEETS-SHEET Z.

Wirdum@ um. MM

, first to mill the ducing the time GASPAR wttsr-KNZ,

or sE'EBAoii, NEAR ZURICH, SWITZERLAND.

MACHINE FOR MILLING DOUBLE HELICAL-'TOOTHED WHEELS.

Specication of Letters Patent.

Patentedoet. 12, 1909.

Application tiled I uly 25, 1904. Serial' No. 218,045.

To all whom it may concern:

Be it known that I, CAsrAR Ws'i-KUNZ, a citizen of the Republic of Switzerland, yresiding at Seebach, near Zurich, in Switzerland, have invented new and useful Improvements in Machines for Milling Double Helical-Toothed Wheels, of which the following is a specilication.

' The machines hitherto employed for milling doubled helical toothed wheels have had the drawback that with those machines it was not possible to mill the teeth running in both directions, that is to say, to mill both halves of the wheel face, at one and the same time. Consequently it has been necessary teeth running in one direction of one half'of the wheel and then mill the teeth running in the other direction of the other half of the wheel.

The present invention has now for its` object to provide a machine for milling double helical teeth in which the above mentioned drawbacks are obviated and whereby the teeth running in both directions can be milled at one and the same time, thereby rerequired for the manufac-4 ture of a double helical toothed wheel as compared with the method of manufacture hitherto employed. l

The-drawings which yare annexed to this specification illustrate by way of example, one construction of a machine according to this invention, Figure 1 being an elevation and Fig. 2 a plan thereof.

The milling machine shown comprises a plate' a on a suitable frame A, two supports and o arranged opposite each other, and each provided with atraversing slide d and e res ectively. The traversing slides carry mova le spindle heads f, g havin spindles It, z' mounted therein, said spin les being driven b any suitable mechanism, preferably suc a mechanism as will positively connect them. As an example of such a mechanism I have shown the spindles as each provided with a bevel gear wheel, 9 and 10 meshing with miter gear wheels lland- 12 respectively. These miter earl wheels are mounted at the upper ends o telescopingl shafts -13 and 14 on Whose lower ends are miter gears 15 and 16 meshing with miter gears 17 and 18 on the auxiliary driving shaft 19 of the machine. This auxiliary driving shaft 19 carries in addition to theI miter gears 17 Y and 18, a worm or helical gear 3 that meshes with4 a' worm or helical gear 2 toothed wheels is as time.

on a transverse shaft g which shaft is the main driving sha-ft of the machine and is provided with` a belt pulley l. y Un the shaft g is a worm g that drives a worm wheel p on the work spindle or shaft n mounted between the suppoits b and c at right anglesto the plate a and whose upper eno has bearing in a bar m connecting the supports and c.

'l'he slides d and e are traversed by screws (l mounted in the supports and each screw carries a chain wheel l connected together by a chain 5. .()n one of the chain Wheels 41s a Worm wheel 7 driven by a worm 8 serving to simultaneously rotate the screws 6 by reason of the chain connection 5. The worm 8 is mounted on a shaft 20 that carries a suitable miter gear 2l, meshing with' a mitei gear 22 on the shaft 23 whose lower end carries a miter wheel 23 that meshes with a miter wheel 24 on shaft 19. The wheel o which is to be cut or milled with double helical teeth is mounted on the spindle or shaft n. The shaft n is connected positively with the spindles of the worm milling cut-ters k. and Z.

The mode of operation of this construction of machine for milling double helical follows: The traversing slides d, e with the milling cutters lc, l are set in such a manner that each milling cutter is caused to act-upon one side of the face of the wheel o which is mounted on the shaft n (Fig. l). Then the milling cutters -are mov ed by means of the traversing slides t0- 'ward the center plane ofthe wheel face while the two milling spindles are beingrotated simultaneously in positiveconnection with the spindle a by means ofthe worm gearing p g. By this movement of the milling cutters which are traversed automatically face, in both halves of the wheel face at the same The double helical toothed wheel is completely milled vwhen the two milling cutters have reached the center plane of the wheel face. Thus it'will be obvious that in order to cut a helical gear wheel by means of the helical cutters that the blank o and the cutters must bevdriven at different p roportionate speeds, z. e. the speed of rotation of the blank must be greater than that sufficient to cut a worm having the same pitch as the cutters.

The'drawings illustrate the manufact-ure toward the center plane of the Wheel the desired double helical teeth are out l of a wheell made in accordance with Iiatent No. 7 65,950, dated July 26, 1904. More than two milling cutters with their appurtenantparts may be used in the same machine.

Havingnow particularly described and ascertained the-nature of the said -invention and in, what manner the same is to be performed I declare that what I claim is:

- 1. In a machine' for cutting double helical gear Wheels, the combination With a wheel blank holder andl means to continuously rotate the same; of a pair of oppositely movable, simultaneously traversable tool slides, equally spaced from the spindle of the blank holder and angularly. separated, a helical milling tool in each slide arranged to cut in 'opposite directions, and-connections for rotating the Wheel blank holder,'traversing the slides and rotating the tools `in timed relation. l ,I

2. In a machine forcutting double helical gear wheels, thec-ombination with a Wheel blank holder and means to rotate the same continuously; of a pair of oppositely movslides, rotating the able simultaneously traversable tool slides, a helical milling tool in each slide arranged to cut from opposite sides of the face of the blank, and connections for traversing the Wheel blank holder and for rotating the tools in timed relation. 3. In a gear cuttin machine, the combination 'with a Wheel lank carrier or work spindle; ofyworm cuttlng tools operating on the blank at opposite sides thereof, and connections for traversing the tools, rotating the blank carrier and rotating the tools in timed-relation, said connections constructed to drive the blank carrier and blank at a.

speed greater than that of a Worm gear havthe same pitch Vas the cutters.

two subscribing witnesses'. h I GASPAR WST-KUNZ. Witnesses: I t I 'l v -Y E. BLUM,

M. VESTE.

in 4o In testimony yvhereofIhave signed my name to this 'specification 'in the-presence of 

